Absolute positioning of element relative to body?

Question

css

How to position an element relative to body if it is in an element with position: relative?
The parent has a certain height and the block that lies in it must stretch 100% in height relative to the body.

Answer 1

You can't do that. Solve this problem in a different way.

Answer 2

Show a picture, code, words are difficult to navigate

Answer 3

This is easier to achieve using flexbox . If support for IE < 10 is not important, then you can safely use it.

Answer 4

You can use fixed, but only if body is the size of the window

Answer 5

why no one said that it's easy in js can be done?